Book discussing Efficiency we saw that ballasted keelboats are limited to Archimedes principle of hull speed 134 x VWL.

Catamaran hull design principles. Blue water cruising programs require significant safety margins. Monohulls when compared to multihulls have low hullfineness ratios. The most important catamaran design hull shape factor is the Prismatic Coefficient Cp.

The basic principle behind a planing hull is that of the generation of sufficient hydrodynamic lift to support the vessel weight. They offer a good balance of comfort and low operational cost and on a technical level are easier for an inexperiencd crew to handle. The waterlines for SYDI design Saint Barbara which shows very little fore-aft movement in LCF at 15º of heel.

Wave-Piercing or Reverse Bows. Catamarans save on weight because the multihull design eliminates the need for a keel counterweight as the same purpose righting the ship is served by the hull spacing. Putting forward a blend of high-tech technologies and know-how.

Nat Herreshoff of Bristol RI did in the late 19th century. We now have the ability to design a hull and decks for a complete multihull directly on a computer screen ref 4. Wave-piercing or reverse bows are considered cutting-edge naval architecture and one of the latest popular catamaran.

Notice that Thidar catamaran is a round bilge hull and our design is a chine hull catamaran. On the other hand they will be able to produce more power than their counterparts in lighter winds and perform better. In creating a chine hull first we draw it by hand adjusting the limits.

This has been improved in the wave piercing catamarans developed to reduce the pitching and in the SWATH Small Waterplane Area Twin Hull design where the water plane area is very much reduced and a larger part of the displaced water volume is well below the water line. Saint Barbara has a very nicely balanced hull. By having the main beds above the bridge deck rather than in the hull.